how have the Sgrub low bloods, especially those from Beforus, survived for so long? don’t trolls have a shorter and shorter lifespan as they go down the hemospectrum?

There used to be a calculator for this but I believe the lowest lifespan (Damara/Aradia) would still be like 20-30 years, and all the homestuck characters are in their teens until the credits in which case there aren’t really any lowbloods left that we know survived (save Karkat and due to his mutation he might have midblood lifespan, unknown)